71.
Solve the equation 3(5
�
−2)=393(5
x
−2)=39
.
Answer
: �
=3
x
=3
.
72.
Calculate the value of �
y
in the equation 2
�
3+7=15
32
y
+7=15
.
Answer
: �
=12
y
=12
.
73.
Find the area of a triangle with base 1010
units and height 66
units.
Answer
: Area = 12×base×height=12×10×6=30
21
×base×height=
21
×10×6=30
square units.
74.
Determine the value of �
z
if 7
�
−5=587
z
−5=58
.
Answer
: �
=9
z
=9
.
75.
Solve the equation 4
�
7−3=5
74
x
−3=5
.
Answer
: �
=28
x
=28
.
76.
Evaluate the expression: 122+5×612
2
+5×6
.
Answer
: 122+5×6=144+30=17412
2
+5×6=144+30=174
.
77.
Calculate the area of a circle with a radius of 99
units (use �
=3.14
π
=3.14
).
Answer
: Area = �
×
�
2=3.14×92=254.34
π
×
r
2
=3.14×9
2
=254.34
square
units.
78.
Solve the inequality: 6
�
+4>226
x
+4>22
.
Answer
: �
>3
x
>3
.
79.
Find the slope of the line perpendicular to �
=−34
�
+2
y
=−
43
x
+2
.
Answer
: The slope of a line perpendicular to this line would be 43
34
.
80.
Solve for �
y
in the equation 13
�
+4=9
31
y
+4=9
.
Answer
: �
=15
y
=15
.
